To lose body fat, you need to eat fewer calories than you burn. When trying to lose belly fat, the Harvard Medical School says you should not cut back so much that it makes it too difficult for you to stick to your weight-loss plan. To lose 1/2 pound to 1 pound a week, you need to reduce your overall calorie intake by 250 calories to 500 calories a day. Tracking your calorie intake before you start your diet can give you an idea of how many calories you currently eat and how many you need to lose weight. The National Heart, Blood and Lung Institute says most men can safely lose weight limiting intake to 1,500 calories to 1,800 calories a day.
It’s not just about weight loss. Having great gut health is linked to good health throughout your body. Scientists in this rapidly growing field are finding connections between gut microbes and the  immune system, weight loss, gastrointestinal health, , allergies, asthma, and even cancer. With every study that’s published, scientists become more convinced that having a healthy gut leads to having a healthy body.
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